<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Wrap content in quotes, and escape all special JSON characters used.
 *
 * @package    core
 * @category   output
 * @copyright  2016 Andrew Nicols <andrew@nicols.co.uk>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace core\output;

/**
 * Wrap content in quotes, and escape all special JSON characters used.
 *
 * @copyright  2016 Andrew Nicols <andrew@nicols.co.uk>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class mustache_quote_helper {

    /**
     * Wrap content in quotes, and escape all special JSON characters used.
     *
     * Note: This helper is only compatible with the standard {{ }} delimeters.
     *
     * @param string $text The text to parse for arguments.
     * @param \Mustache_LambdaHelper $helper Used to render nested mustache variables.
     * @return string
     */
    public function quote($text, \Mustache_LambdaHelper $helper) {
        $content = trim($text);
        $content = $helper->render($content);

        // Escape the {{ and JSON encode.
        $content = json_encode($content);
        $content = preg_replace('([{}]{2,3})', '{{=<% %>=}}${0}<%={{ }}=%>', $content);
        return $content;
    }
}
